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The David A. Johnston Cascades Volcano Observatory (CVO) is a volcano observatory in the US that monitors volcanoes in the northern Cascade Range. It was established in the summer of 1980, after the eruption of Mount St. Helens . [ 2 ]
This is a list of Cascade volcanoes, i.e. volcanoes formed as a result of subduction along the Cascadia subduction zone in the Pacific Northwest of North America. The volcanoes are listed from north to south, by province or state: British Columbia , Washington , Oregon , and California .
The Cascade volcanoes have had more than 100 eruptions over the past few thousand years, many of them explosive eruptions. [21] However, certain Cascade volcanoes can be dormant for hundreds or thousands of years between eruptions, and therefore the great risk caused by volcanic activity in the regions is not always readily apparent.
A volcano observatory is an institution that conducts research and monitoring of a volcano. Each observatory provides continuous and periodic monitoring of the seismicity , other geophysical changes, ground movements, volcanic gas chemistry, and hydrologic conditions and activity between and during eruptions .
Sign showing the full and official name of the David A. Johnston Cascades Volcano Observatory (CVO) Early acts of commemoration included two trees that were planted in Tel Aviv, Israel, [8] and the renaming of a community center in Johnston's hometown as the "Johnston Center". These actions were reported in newspapers during the first ...
However, most eruption hazards from basaltic volcanoes are generally restricted to within 9.3 miles (15 km) of the vent, with some exceptions. [56] According to the Volcano Hazards Program of the United States Geological Survey's Cascades Volcano Observatory, the threat potential from Belknap is "Low/Very Low". [2]
Gardner at Mount St. Helens in 2004. Cynthia A. Gardner is an American geologist and volcanologist noted for her work on Mount St. Helens. [1] [2] She was the acting Scientist-in-Charge (SIC) of the Cascades Volcano Observatory during the 2004 volcanic reawakening at Mount St. Helens, and officially served as SIC from 2005 to 2010—the first female to fill the role. [3]
It is monitored by the Pacific Northwest Seismic Network and the Cascades Volcano Observatory via a seismic station on the southwest flank of the mountain. [47] During the month of September of 2024, the U.S. Geological Survey Cascades Volcano Observatory recorded six earthquakes ranging in magnitudes 0.9 to 2.0. With a normal rate of one ...